U.S. President Barack Obama and former President Bill Clinton walk past the Rose Garden to host an event marking the 20th anniversary of the national service program AmeriCorps at the White House in Washington

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and others, stand on the South Lawn of the White House in Washington on Thursday, as they observe a moment of silence to mark the 13th anniversary of the 9/11 attacks

Michelle Obama, US first lady, and her daughters Sasha and Malia welcome the official White House Christmas tree to the White House in Washington. The 18.5ft Douglas Fir was grown by Chris Botek, a second-generation Christmas tree farmer from Crystal Spring Tree Farm in Lehighton, Pennsylvania.

A Marine on Tuesday closes the door to Marine One, carrying President Barack Obama, on the south lawn of the White House, Washington. Mr Obama is travelling to the New Jersey shore to survey rebuilding efforts in areas affected by last year’s Hurricane Sandy.

US President Barack Obama and British Prime Minister David Cameron walk off the stage after their joint news conference on Monday in the East Room of the White House in Washington, where they talked about various topics including Syria’s civil war.